(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A ball is thrown downward from a height of 30m at 8m/s. How long until it hits the ground?

(Air resistance is negligible and gravity is 9.8m/s

2. Relevant equations

I tried deltaX=Vi+(1/2)a(t^2) and came out with 2.12, but the solution says it's 1.79.

3. The attempt at a solution

30=8+(1/2)(9.8)(t^2)

22=4.9(t^2)

sqrt4.49=sqrt(t^2)

t=2.12

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# Homework Help: How long until the ball hits the ground?

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